Relativistic outflow in CXO CDFS J033260.0-274748

Details Relativistic outflow in CXO CDFS J033260.0-274748 Relativistic outflow in CXO CDFS J033260.0-274748

2005-08-10

arxiv.org/abs/astro-ph/0508225v1

Astrophys.J.631:L33-L36,2005

Astronomy and Astrophysics

Astrophysics

ApJ letter accepted

Scientific paper

10.1086/496970

In this letter we report the detection of a strong and extremely blueshifted X-ray absorption feature in the 1 Ms Chandra spectrum of CXO CDFS J033260.0-274748, a quasar at z = 2.579 with L_2-10keV ~ 4x10^44 ergs/s. The broad absorption feature at ~ 6.3 keV in the observed frame can be fitted either as an absorption edge at 20.9 keV or as a broad absorption line at 22.2 keV rest frame. The absorber has to be extremely ionized with an ionization parameter \xi ~ 10^4, and a high column density N_H >5x10^23 cm^-2. We reject the possibility of a statistical or instrumental artifact. The most likely interpretation is an extremely blueshifted broad absorption line or absorption edge, due to H or He--like iron in a relativistic jet-like outflow with bulk velocity of ~ 0.7-0.8 c. Similar relativistic outflows have been reported in the X-ray spectra of several other AGNs in the past few years.

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